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Chemistry Assertion (A) & Reason (B) MCQ [1M]

MODEL PAPER 3 · Bihar Board (BSEB) STD 12 Science (BSEB - English Medium). 4 questions.

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Assertion (A) & Reason (B) MCQ [1M]

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4 questions · timed · auto-graded

MCQ 11 Mark
Assertion (A): (CH3)3C-O-CH3 gives (CH3)3C-I and CH3OH on treatment with HI.
Reason (R): The reaction occurs by SN1 mechanism.
  • ✓
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • D
    A is false but R is true.
Answer
Correct option: A.
Both A and R are true and R is the correct explanation of A.
(a) Both A and R are true and R is the correct explanation of A.
Explanation: (CH3)3C-O-CH3 gives (CH3)3C-I and CH3OH on treatment with HI. The reaction occurs by SN1 mechanism.
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MCQ 21 Mark
Assertion (A): Vitamin C cannot be stored in our body.
Reason (R): Vitamin C is fat soluble and is excreted from the body in urine.
  • A
    Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
  • B
    Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
  • ✓
    Assertion (A) is true, but Reason (R) is false.
  • D
    Assertion (A) is false, but Reason (R) is true.
Answer
Correct option: C.
Assertion (A) is true, but Reason (R) is false.
(c) Assertion (A) is true, but Reason (R) is false.
Explanation: In a tetrapeptide, there are four amino acids connected by three peptide bonds
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MCQ 31 Mark
Assertion (A): Oximes are less acidic than hydroxyl amine.
Reason (R): Oximes of aldehydes and ketones show geometrical isomerism.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A.
  • C
    A is true but R is false.
  • ✓
    A is false but R is true.
Answer
Correct option: D.
A is false but R is true.
(d) A is false but R is true.
Explanation: Oximes are more acidic because, there is a delocalisation of $\pi$ electrons (i.e. resonance) and it stabilises it and its conjugate acid. But no such resonance exists in hydroxyl amine base (NH2O-).
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MCQ 41 Mark
Assertion (A): Alkylbenzene is not prepared by Friedel-Crafts alkylation of benzene.
Reason (R): Alkyl halides are less reactive than acyl halides.
  • A
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true but R is not the correct explanation of A.
  • ✓
    A is true but R is false.
  • D
    A is false but R is true.
Answer
Correct option: C.
A is true but R is false.
(c) A is true but R is false.
Explanation: Alkyl halides give polyalkylation products.
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Assertion (A) & Reason (B) MCQ [1M] - Chemistry STD 12 Science Questions - Vidyadip